Current collector plate, end cap assembly, battery, and vehicle
By setting a smooth transition arc surface between the tab connection and the terminal connection of the current collector, the problem of sharp corners piercing the insulation is solved, and the battery's short-circuit resistance and reliability are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU EVE POWER CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-07-28
AI Technical Summary
In existing cylindrical batteries, the folded structure of the current collector forms sharp corners, which can easily puncture the insulation, causing a short circuit and reducing the reliability of the battery.
The first side of the collector plate and the first crease are smoothly transitioned between the tab connection and the post connection, and the second side is also smoothly transitioned between the tab and the first crease to avoid sharp corners. The curved surface design is used to alleviate stress concentration.
It improves the battery's resistance to short circuits under external pressure, thus enhancing the battery's reliability.
Smart Images
Figure CN224570325U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a current collector, an end cap assembly, a battery, and a vehicle. Background Technology
[0002] In a cylindrical battery structure, the tabs of the cell are electrically connected to the terminals on the end cap via a current collector, and the end cap and current collector are insulated from each other by an insulating component. Currently, to accommodate the packaging space requirements of a cylindrical casing and to meet the assembly requirement of the current collector simultaneously connecting the terminals and the cell tabs, a foldable current collector structure is typically used. However, the sharp corners formed by this folding structure pose a safety hazard. When the battery is subjected to external pressure, the sharp corners can easily pierce the insulating component and come into contact with the end cap, leading to a short circuit and reduced battery reliability. Utility Model Content
[0003] Embodiments of this application provide a collector, end cap assembly, battery, and vehicle to at least partially solve the aforementioned technical problems.
[0004] In a first aspect, embodiments of this application provide a collector plate, including a pole post connecting portion and a tab connecting portion, the tab connecting portion being connected to the pole post connecting portion; a first crease is formed between the pole post connecting portion and the tab connecting portion; on one side of the collector plate in the width direction, the tab connecting portion has a first side surface connected to the first crease, and the pole post connecting portion has a second side surface connected to the first crease; at least one of the first side surface and the second side surface smoothly transitions to the first crease.
[0005] In one possible implementation, at least one of the first side and the second side is a curved surface.
[0006] In one possible implementation, at least one of the first side and the second side is an arc surface.
[0007] In one possible implementation, the radius of the arc surface is R, and the width of the collector disk is W, satisfying that 2% ≤ R / W ≤ 10%.
[0008] In one possible implementation, 0.5mm ≤ R ≤ 5mm.
[0009] In one possible implementation, the radius of the arc surface is R, and the arc length of the arc surface is L, satisfying 1 / 6 ≤ L / 2πR ≤ 1 / 4.
[0010] In one possible implementation, a positioning part is provided on at least one side of the pole connection portion along the width direction of the collector plate.
[0011] In one possible implementation, the positioning part is a recess provided on the side of the pole connection part.
[0012] In one possible implementation, the pole connection includes a pole connection body and a transition portion, one end of the transition portion is connected to the tab connection portion and the other end is connected to the pole connection body, and a second crease is formed between the pole connection body and the transition portion, wherein the first crease is located between the transition portion and the tab connection portion.
[0013] In one possible implementation, on one side of the manifold in the width direction, the pole connection body has a third side connecting to the second crease connection, and the transition portion has a fourth side connecting to the second crease, wherein at least one of the third side and the fourth side smoothly transitions to the second crease.
[0014] Secondly, embodiments of this application provide an end cap assembly, including the manifold provided in any embodiment of the first aspect.
[0015] Thirdly, embodiments of this application provide a battery including the end cap assembly of the second aspect or the current collector provided in any embodiment of the first aspect.
[0016] Fourthly, embodiments of this application provide a vehicle including the battery provided in the third aspect, the end cap assembly of the second aspect, or the collector provided in any embodiment of the first aspect.
[0017] The beneficial effects of the embodiments of this application are as follows:
[0018] In the embodiments of this application, by smoothly transitioning at least one of the first side and the second side to the first crease, it is not easy for a sharp corner to be formed at the position where the first side and the first crease meet, and / or it is not easy for a sharp corner to be formed at the position where the second side and the first crease meet. As a result, when the battery is subjected to external pressure, the current collector is not easy to puncture the insulation, which helps to reduce the short circuit risk of the battery and improve the reliability of the battery. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A schematic diagram of the end cap assembly provided in some embodiments of this application from one view.
[0021] Figure 2A schematic diagram of the end cap assembly provided for some embodiments of this application from another perspective;
[0022] Figure 3 A bottom view of an end cap assembly provided for some embodiments of this application, wherein the collector disk is in an deployed state;
[0023] Figure 4 A bottom view of an end cap assembly provided for some embodiments of this application, wherein the collector disk is in a folded state;
[0024] Figure 5 A schematic diagram of the end cap assembly provided in some other embodiments of this application from one view.
[0025] Figure 6 A structural schematic diagram of the end cap assembly provided for other embodiments of this application from another perspective;
[0026] Figure 7 A bottom view of an end cap assembly provided for some other embodiments of this application, wherein the collector disk is in an deployed state;
[0027] Figure 8 A bottom view of an end cap assembly provided for some other embodiments of this application, wherein the manifold is in a folded state.
[0028] Explanation of reference numerals in the attached figures:
[0029] 100-End cap assembly;
[0030] 10-Collector disk;
[0031] 11-Electrode connection part; 111-First side surface;
[0032] 12-Pole post connection part; 121-Pole post connection body; 122-Transition part; 123-Second side surface; 124-Third side surface; 125-Fourth side surface; 126-Positioning part;
[0033] 13 - First crease;
[0034] 14 - Second crease;
[0035] 30-End cap;
[0036] 20 - Insulating components;
[0037] Y-width direction;
[0038] 40-Pole Column; Detailed Implementation
[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0040] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 , Figure 1 A schematic diagram of the end cap assembly 100 from one viewpoint provided for some embodiments of this application; Figure 2 A schematic diagram of the end cap assembly 100 provided for some embodiments of this application from another perspective; Figure 5 A schematic diagram of the end cap assembly 100 provided in some other embodiments of this application from one view. Figure 6 This is a schematic diagram of the end cap assembly 100 provided in other embodiments of this application from another perspective. Embodiments of this application provide an end cap assembly 100. In some embodiments, the end cap assembly 100 includes an end cap 30, an insulating member 20, a terminal post 40, and a current collector 10. The terminal post 40 is insulatedly disposed on the end cap 30, and the current collector 10 is disposed on the inner side of the end cap 30. The insulating member 20 is disposed on the inner side of the end cap 30 and located between the current collector 10 and the end cap 30. The inner side of the end cap 30 refers to the side of the end cap 30 facing the battery cell.
[0041] In some embodiments, the pole post 40 is riveted to the end cap 30.
[0042] Among them, the insulating component 20 can be a rubber component, a plastic component, etc.
[0043] In some embodiments, both the pole post 40 and the tab are welded to the manifold 10.
[0044] Both the pole post 40 and the tab are connected to the collector plate 10. The collector plate 10 adopts a foldable structure design, which allows it to have two working modes: unfolded and folded. In the unfolded state, it is easy to connect the pole post 40 and the tab to the collector plate 10 respectively; in the folded state, the collector plate 10 compresses its own space occupation through preset bending deformation, thereby meeting the space constraint requirements of the internal packaging of the shell.
[0045] Based on different battery design requirements, the current collector 10 can adopt different folding designs.
[0046] In some embodiments, refer to Figure 1 and Figure 2The current collector 10 adopts a single-fold design, meaning it can be folded once. This single-fold design simplifies the structure of the current collector 10 and helps reduce battery production costs.
[0047] In some embodiments, refer to Figure 5 and Figure 6 The current collector 10 adopts a two-fold design, that is, the current collector 10 can be folded twice. The two-fold current collector 10 helps to improve the current carrying capacity, and is especially suitable for large cylinders.
[0048] Reference Figure 3 and Figure 4 , Figure 3 A bottom view of an end cap assembly 100 provided for some embodiments of this application, wherein the collector plate 10 is in an unfolded state; Figure 4 This is a bottom view of an end cap assembly 100 provided for some embodiments of this application, wherein the collector plate 10 is in a folded state. In some embodiments, the collector plate 10 includes a pole post connection portion 12 and a tab connection portion 11, the tab connection portion 11 being connected to the pole post connection portion 12. A first crease 13 is formed between the pole post connection portion 12 and the tab connection portion 11. On one side of the collector plate 10 in the width direction Y, the tab connection portion 11 has a first side surface 111 connecting to the first crease 13, and the pole post connection portion 12 has a second side surface 123 connecting to the first crease 13. At least one of the first side surface 111 and the second side surface 123 smoothly transitions to the first crease 13.
[0049] It is understood that the tab connection portion 11 is used to connect the tabs of the battery cell, and the terminal connection portion 12 is used to connect the terminal 40. The tab connection portion 11 may have at least one welding area to facilitate welding the tab connection portion 11 and the tabs of the battery cell together in the welding area.
[0050] In one example, the pole connection 12 is provided with a through hole for the pole 40 to pass through. In yet another example, the pole connection 12 is welded to the pole 40.
[0051] It can be understood that the first crease 13 is a pre-set crease on the collector plate 10, located between the pole connection part 12 and the pole tab connection part 11. By setting the first crease 13, the collector plate 10 can be folded and unfolded.
[0052] The transition between the first side 111 and the first crease 13 can be smooth, or the transition between the second side 123 and the first crease 13 can be smooth. For example, both the first side 111 and the second side 123 can smoothly transition with the first crease 13.
[0053] In this application, by smoothly transitioning at least one of the first side 111 and the second side 123 to the first crease 13, it is not easy for a sharp corner to be formed at the position where the first side 111 and the first crease 13 meet, and / or it is not easy for a sharp corner to be formed at the position where the second side 123 and the first crease 13 meet. As a result, when the battery is subjected to external pressure, the current collector 10 is not easy to puncture the insulating member 20, which helps to reduce the short circuit risk of the battery and improve the reliability of the battery.
[0054] In some embodiments, at least one of the first side surface 111 and the second side surface 123 is a curved surface. This configuration helps to improve the smoothness of the first side surface 111 or the second side surface 123 and alleviate the stress concentration caused by the first side surface 111 or the second side surface 123 on the insulating member 20.
[0055] For example, both the first side surface 111 and the second side surface 123 are arc surfaces.
[0056] In some embodiments, at least one of the first side surface 111 and the second side surface 123 is an arc surface, so as to control the machining accuracy of the first side surface 111 or the second side surface 123 and reduce the manufacturing difficulty of the collector plate 10.
[0057] In some embodiments, the radius of the arc surface is R, and the width of the current collector 10 is W, satisfying 2% ≤ R / W ≤ 10%. This configuration balances the structural strength of the current collector 10 and the reliability of the battery.
[0058] For example, R / W can be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, and any value in between.
[0059] In some embodiments, 0.5mm ≤ R ≤ 5mm. This configuration balances the structural strength of the current collector 10 with the reliability of the battery.
[0060] For example, R can be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, or any value in between.
[0061] In some embodiments, the radius of the arc surface is R, and the arc length of the arc surface is L, satisfying 1 / 6≤L / 2πR≤1 / 4.
[0062] For example, L / 2πR can be 1 / 6, 5 / 24, 3 / 16, 1 / 4, and any value in between.
[0063] Reference Figure 3In some embodiments, a positioning part 126 is provided on at least one side of the pole connection portion 12 along the width direction Y of the collector plate 10. The positioning part 126 can cooperate with a positioning fixture so that the positioning fixture can position the collector plate 10 during the processing of the collector plate 10.
[0064] For example, positioning portions 126 are provided on both sides of the width direction Y of the manifold 10.
[0065] In some embodiments, the positioning part 126 and the second side surface 123 are spaced apart along the length direction of the collector plate 10, and the positioning part 126 is located on the side of the second side surface 123 opposite to the tab connection part 11. Here, the length direction of the collector plate 10 refers to the length direction of the collector plate 10 in its unfolded state.
[0066] In some embodiments, the positioning portion 126 is a recess provided on the side of the pole post connection portion 12.
[0067] In other embodiments, the positioning part 126 may be a protrusion extending from the side of the collector plate 10.
[0068] Reference Figure 7 and Figure 8 , Figure 7 A bottom view of an end cap assembly 100 provided for other embodiments of this application, wherein the collector plate 10 is in an unfolded state; Figure 8 A bottom view of an end cap assembly 100 provided for other embodiments of this application, wherein the manifold 10 is in a folded state. In some embodiments, the manifold 10 is designed to be bifolded.
[0069] In some embodiments, the pole connection portion 12 includes a pole connection body 121 and a transition portion 122. One end of the transition portion 122 is connected to the tab connection portion 11, and the other end is connected to the pole connection body 121. A second crease 14 is provided between the pole connection body 121 and the transition portion 122, and a first crease 13 is located between the transition portion 122 and the tab connection portion 11.
[0070] It is understood that there is a crease between the transition portion 122 and the tab connection portion 11, and a crease between the transition portion 122 and the pole connection body 121.
[0071] In some embodiments, on one side of the manifold 10 in the width direction Y, the pole connecting body 121 has a third side surface 124 that connects to the second crease 14, and the transition portion 122 has a fourth side surface 125 that connects to the second crease 14, and at least one of the third side surface 124 and the fourth side surface 125 smoothly transitions to the second crease 14.
[0072] For example, both the third side 124 and the fourth side 125 smoothly transition to the second crease 14.
[0073] In this embodiment, by smoothly transitioning at least one of the third side 124 and the fourth side 125 to the second crease 14, the position where the third side 124 meets the second crease 14 is less likely to form a sharp corner, and / or the position where the fourth side 125 meets the second crease 14 is less likely to form a sharp corner. As a result, when the battery is subjected to external pressure, the current collector 10 is less likely to puncture the insulating member 20, which helps to reduce the short circuit risk of the battery and improve the reliability of the battery.
[0074] In some embodiments, at least one of the third side 124 and the fourth side 125 is a curved surface. This configuration helps to improve the smoothness of the third side 124 or the fourth side 125 and alleviate the stress concentration caused by the third side 124 or the fourth side 125 on the insulating member 20.
[0075] For example, the third side 124 or the fourth side 125 are both arc surfaces.
[0076] In some embodiments, at least one of the third side 124 or the fourth side 125 is an arc surface, so as to control the machining accuracy of the third side 124 or the fourth side 125 and reduce the manufacturing difficulty of the collector plate 10.
[0077] For example, both the third side 124 and the fourth side 125 are arc surfaces.
[0078] In embodiments where a positioning part 126 is provided in the pole connection part 12, the positioning part 126 may be provided in the transition part 122 or in the pole connection body 121.
[0079] In some embodiments, the thickness of the manifold 10 is between 0.1 mm and 3 mm.
[0080] Reference Figures 1 to 8 Embodiments of this application provide an end cap assembly 100, including the aforementioned manifold 10. Since the end cap assembly 100 includes the aforementioned manifold 10, the end cap assembly 100 has all the beneficial effects of the manifold 10, which will not be repeated here.
[0081] Embodiments of this application provide a battery including the end cap assembly 100 or the current collector 10 described above. Since the battery includes the current collector 10, it possesses all the beneficial effects of the current collector 10, which will not be elaborated further here.
[0082] In some embodiments, the battery is cylindrical and includes a housing, a cell, and an end cap assembly 100. The cell is disposed within the housing, which is cylindrical and has an opening at one end in the axial direction of the battery. The end cap assembly 100 covers the opening.
[0083] Embodiments of this application provide a vehicle including the aforementioned battery, end cap assembly 100, or manifold 10. Since the vehicle includes the manifold 10, it possesses all the beneficial effects of the manifold 10, which will not be elaborated upon here.
[0084] The vehicles can be gasoline-powered vehicles, electric vehicles, or hybrid vehicles.
[0085] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0086] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0087] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.
[0088] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A collector disk, characterized in that, include: pole connection part; The tab connection part is connected to the pole post connection part; A first crease is present between the pole post connector and the tab connector. On one side of the collector plate in the width direction, the tab connector has a first side surface that connects to the first crease, and the pole post connector has a second side surface that connects to the first crease. At least one of the first side surface and the second side surface smoothly transitions to the first crease.
2. The collector disk according to claim 1, characterized in that, At least one of the first side and the second side is a curved surface.
3. The collector disk according to claim 2, characterized in that, At least one of the first side and the second side is an arc surface.
4. The collector disk according to claim 3, characterized in that, The radius of the arc surface is R, and the width of the collector plate is W, satisfying that 2% ≤ R / W ≤ 10%.
5. The collector disk according to claim 4, characterized in that, 0.5mm≤R≤5mm.
6. The collector disk according to claim 3, characterized in that, The radius of the arc surface is R, and the arc length of the arc surface is L, satisfying 1 / 6≤L / 2πR≤1 / 4.
7. The collector disk according to claim 1, characterized in that, Along the width direction of the collector plate, at least one side of the pole connection portion is provided with a positioning portion.
8. The collector disk according to claim 7, characterized in that, The positioning part is a recess located on the side of the pole connection part.
9. The collector disk according to any one of claims 1-8, characterized in that, The pole connection includes a pole connection body and a transition part. One end of the transition part is connected to the pole tab connection part, and the other end is connected to the pole connection body. A second crease is formed between the pole connection body and the transition part, and the first crease is located between the transition part and the pole tab connection part.
10. The collector disk according to claim 9, characterized in that, On one side of the manifold in the width direction, the pole connecting body has a third side connecting to the second crease, and the transition portion has a fourth side connecting to the second crease. At least one of the third side and the fourth side smoothly transitions to the second crease.
11. An end cap assembly, characterized in that, Includes the collector disk as described in any one of claims 1-10.
12. A battery, characterized in that, Includes the end cap assembly as described in claim 11 or the manifold as described in any one of claims 1-10.
13. A vehicle, characterized in that, Includes the end cap assembly of claim 11, the battery of claim 12, or the current collector of any one of claims 1-10.